Ghost notes produced when pushing the string(s) on the fret (or fingers on the string, I am not sure) or even worse when lifting off the finger(s). The latter can produce one or two undesired notes, typically with a short duration < 50 ms, but well to hear. Thats why I have tested a filter, which deletes all notes below an adjusteable time length. To do so the filter has to wait for this time before it can detect such notes and there will be additional latency as an adverse side effect (for about the set min. time). The filter works well (see picture,where the min. time was set to 30 ms), one have to check if the additional latency is acceptable. Beside the set (standard) midi channel where the filtered notes will be output, there is an unfiltered output with no additional latency on midi channel 16. If the latency is uncomfortable this channel can be used for monitoring and the other for recording a cleaned version.
To add to @nassim answer on why your model generates the same output over and over again. It is because the optimizer does not zero-out the gradients and thus the parameter update does not take place. I would suggest, instead of calling zero_grad() method on your model, try to call optimizer.zero_grad() and see if that changes anything.
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Genetic algorithms are optimization techniques especially useful in functions whose nonlinearity makes an analytical optimization impossible. This kind of functions appear when using least squares estimators in nonlinear regression problems. Least squares optimizers in general, and the Levenberg-Marquardt method in particular, are iterative methods especially designed to solve this kind of problems, but the results depend on both the features of the problem and the closeness to the optimum of the starting point. In this paper we study the least squares estimator and the optimization methods that are based on it. Then we analyze those features of real-coded genetic algorithms that can be useful in the context of nonlinear regression. Special attention will be devoted to the crossover operator, and a new operator based on confidence intervals will be proposed. This crossover provides an equilibrium between exploration and exploitation of the search space, which is very adequate for this kind of problems. To analyze the fitness and robustness of the proposed crossover operator, we will use three complex nonlinear regression problems with search domains of different amplitudes and compare its performance with that of other crossover operators and with the Levenberg-Marquardt method using a multi-start scheme.
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